Gigartina mainillosa (Good, et Wood.) J. Ag., Strömt'. Algveg. p. 31. 



It grows in the litoral zone on rocks and in rock-pools at low- 

 water-mark in company with Ghondrus crispus. GolJected with cystocarps 

 in July-Sept. The frond is 4 — 8 cm. high, varying in breadth; the 

 broader forms — 6 — 7 mm. broad — occur in S. and SW. Icel. In 

 SeyÖisfjöröur (E. Icel.) I met with a sterile form, f. linearis, with fronds 

 10 cm. high, much narrower than in f. typica and nearly unbranched. 



E. Icel. SeyÖisfjöröur. 



N. Icel. Eyjafjöröur. 



NW. Icel. Hrütafjöröur. 



SW. Icel. and S. Icel. common. 



Ahnfeltia plicata (Huds.) Fries, Strömf. Algveg. p. 31. 



In the litoral zone on rocks near low-w T ater-mark, and in the upper 

 sublitoral region. Collected only sterile, in April — Jane and October. 

 Fronds 8 — 10 cm. high. Specimens with galls are not rare. 



N. Icel. Washed ashore in Skagafjöröur (Strömfeit). 

 NW. Icel. Washed ashore at fsafjörÖur (Strömfeit). 

 SW. Icel. and S. Icel. rather common. 



Phyllophora Brodiæi (Turn.) J. Ag. 



* inteiTupta (Grev.) K. Rosenv. Grl. Havalg. p. 821. 



It grows in the sublitoral region in a depth af 3 — 14 fathoms. 

 Fronds 5 — 7 cm. high. This species, only known from the Artie area 

 of the Icelandic seas, occurs probably also in the Atlantic area. 



E. Icel. Hûsavi'k, Brunavik, Borgarfjöröur. 

 NW. Icel. Önundarfjöröur, Dyrafjöröur (Ldbk.). 



Pliyllophora membranifolia (Good, et Wood.) J. Ag., Strömf. 

 Algveg. p. 30. 



In the lower litoral zone. Fronds 4 — 7 cm. high. The leaves 

 3 — 7 mm. broad. 



SW. Icel. Hjallasandur; Reykjavik, Njarövi'k (G. O.). 

 S. Icel. Eyrarbakki (Ström felt). 



Pliyllophora rubens (Good, et Wood.) Grev. 



In the herbarium of the Bot. Mus. in Copenhagen there are some speci- 

 mens of this plant, which are said to have been collected in Iceland. On the 

 label is written in Miss Caroline Rosenbergs handwriting: Ex Islandia. As 

 both the finding-place in Iceland and the collector are unknown , I mention 

 this species here as a doubtful Icelandic plant. 



